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References

For Schwalbea

Pennell, F.W. 1935. The Scrophulariaceae of eastern temperate North America. Academy of Natural Sciences of Philadelphia Monograph No. 1.

Sorrie, B.A. 2019a. Schwalbea. In Flora of North America Editorial Committee. 2019. Flora of North America north of Mexico. Volume 17, Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York, NY. 737 pp.

Ward, D.B. 2012a. New combinations in the Florida flora III. Phytologia 94: 459-485.

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